Boiler.



' A lPatented Jan. 7, |902. (LJ. CBONIN. v

' BUILER.

I (Application mea Aug; s1, 1901.)

(no Model.) 2 shuts-snm u 5 F WITNESSES: /NVENTVOH Tn: N'onms PETERS ca. PHOTuLImo.. wAsHmcTnN. o. r.

UNITED STATES A PATENT OEEICE.

CORNELIUS J.' CRONIN, oF YouNGsrowN,o1-no.

BOILER.

SPECIFICATION forming part of Letters Patent No. 690,701, dated January '7, 1902. Application iiled August 31, 1901. Serial No. 73,921- (No model.)

Improved Boiler, of which the following is a full, clear, and exact description.

This invention relates to a water-tube boiler; and the object is to so dispose the water-carrying pipes that they will be more effectively subjected to the action of the furnace lire,

v and thus increase the efficiency of the boiler.

It is also an object of my invention to provide means by which the capacity of the boiler may be increased, which end I attain by supplying additional tubes arranged in layers. j

A further object is to provide easy and convenient means for cleaning the tubes and removing defective tubes and substituting new ones in their place.

This specication is a specific description of one form of the invention,-while the claims are definitions of the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this speciication,

in which similar characters of reference indi-v cate corresponding parts in both views.

Figure l is a front-view of' a boiler with parts broken away on irregular lines to show the interior construction thereof, and Fig. 2 is a longitudinal section of the boiler.

a. indicates the front wall of the boiler masonry or casing, and b the back wall.

c indicates the side Walls.

. e indicates the grate in the' fire-box, and f indicates a bridge-wall,which is arranged back of the fire-box. This bridge-wall has an arcshaped upper edge on which is arranged a correspondingly shaped partition g. The partition g and bridge-wall f form the combustion-chamber h. At the top of the 'combustion-chamber Zt is an auxiliary combustion-chamber h', and from the rear end of the combustion-chamber leads the stack jindicates anopening in the partition g, through which the burning gases pass from the fire-box downward into the combustionchamber.

Zc indicates two mud-drums which extend 5o throughout the length of the boiler and are located one at each side thereof, these drums being seated in the masonry of the boiler and extending from the front wall a, to the rear wall h and through saidwalls. vAt the outer side of each Wall a and b is an arc-shaped tube-- sheet Z, the front tube-sheet being arranged at a higher elevation than the rear tube-sheet. The mud-drums Za are also inclined, as shown in Fig. 2. 4

Passing through the front and rear walls of the boiler and through the tube-sheets Zare the Water-tubes m. These tubes also extend through the bridge-wall f and form an arch over the fire-box and combustion-chamber, the tubes covering the entire area of each tube-sheet from one mud-drum' to the other. vn indicates arc-shaped heads,"which are bolted or otherwise fastened to the tubea sheets Z at the outer sides thereof. These parts Z and n form arc-shaped water-passages 'with Which the tubes m communicate. y The mud-drums Ze also communicate with these passages. Now by reference to the drawings it will be seen that the peculiar arrangement ofthe tubes insures that'all of the heat generated in the fire-box and combustionchamber will be applied directly to the water-tubes. These tubes are not merely at the top of the water-space, but are at the top and side thereof, so that the lirev of the furnace instead of being wasted against the brick walls, as here tofore, acts not only at the top but at the sides on water-tubes forming active circulating parts of the boiler.y

o indicates two drums, which extend transversely of the boiler above the tubes, one being located just over the fire-box and the other being located in the auxiliary combustion-chamber h'. These drums o are connected by a number of tubes p with the tubesheets Z. The front drum o is connected with the rear tube-sheet, and the rear drum is connected with the front tube-sheet, the tubes p crossing each other alternately, as indicated. These tubes p communicate with the waterspace between the parts Z and n the same as the tubes m. u

q indicates a steam drum or dome communicating withA and extending between the drums o.

A boiler thus constructed insures a more intimate contact vbetween the fire and the IOO water-carrying pipes than heretofore, and consequently a more efficient generation of steam is assured.

It will be observed that by removing the oval heads fn access may be had to the tubes, which ma;7 then be readily cleaned by passinga swab through them. Alsoif it becomes necessary to remove a tube it can be done by simply cutting away the upset end at the outer surface and then the tube can be forced out through the opposite tube-sheet and without being obliged to go into the boiler.

Various changes in the form, proportions, and minor details of my invention may be resorted to without departing from the spirit and scope of my invention. Hence I consider myself entitled to all such variations as may lie within the scope of my claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a steam-boiler, the combination of a number of water-tubes arranged in arched form over and around the fire-box and extending down into the vicinity of the grate at the sides thereof, the arched tube-sheet securing said tubes in place, the arch-shaped heads of oval cross-sectional form fastened to the tube-sheets to form the water-passages with which said tubes communicate, and the mud-drums communicating with said waterpassages and extending longitudinally along each sideof the boiler substantially parallel with and the full length of the water-tubes.

2. A boiler having a fire-box, a vnumber of water-tubes arranged in arc-shaped form over the fire-box to surround the top and sides thereof, meansformingarc-shaped water-passages with which the ends of the tubes communicate, and a mud-drum extending longitudinally along each side of the fire-box essentially parallel with the water-tubes and communicating with said water-passages.

3. A boiler having a tire-box, a number of water-tubes arranged in arc-shaped form over the fire-box to surround the top and sides thereof, means formingarc-shaped water-pas sages with which the ends of the tubes conicit-0,761

verse drums located above the Water-tubes, n,

and tubes passing from the said arc-shaped water-passages to the said transverse drums.

4. A boiler having a fire-box, a number of water-tubes arranged in arc-shaped form over the fire-box to surround the top and sides thereof, means forming arc-shaped Water-passages with which the ends of the tubes co1nmunicate, a mud-drum extending longitudinally along each side of the fire-box essentially parallel With the water-tubes and conimunicating with said waterpassages, transverse drums located above the water-tubes, tubes passing from the said arc-shaped Waterpassages to the said transverse drums, and a steam-dome extending longitudinally of the boiler and communicating at its ends with said transverse drums.

5. A boiler having a casing comprising opposite walls, water-tubes extending through the casing from one of said Walls to the other, a tube-sheet lying against the outer surface of each wall, through which tube-sheets all of said tubes are passed, and an outwardly'- bulged head fastened over each tube-sheet to form on each of said opposite walls of the casinga Water-passage with which the tubes communicate.

6. A boiler having means forming waterpassages,watertubes extending between said passages, drums located above the tubes respectively adjacent to the passages, and additional tubes connecting the drums with the water-passages, the said additional tubes extending alternately across each other to con-A nect together in pairs the distant drums and Water-passages.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CORNELIUS J. CRONIN.

Witnesses:

J. EDGAR Runen, KATHERINE CONNOR. 

